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| 31 | </td>
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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QGridView Class Reference</h1>
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| 33 |
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| 34 | <p>The QGridView class provides an abstract base for
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| 35 | fixed-size grids.
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| 36 | <a href="#details">More...</a>
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| 37 | <p><tt>#include <<a href="qgridview-h.html">qgridview.h</a>></tt>
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| 38 | <p>Inherits <a href="qscrollview.html">QScrollView</a>.
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| 39 | <p><a href="qgridview-members.html">List of all member functions.</a>
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| 40 | <h2>Public Members</h2>
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| 41 | <ul>
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| 42 | <li class=fn><a href="#QGridView"><b>QGridView</b></a> ( QWidget * parent = 0, const char * name = 0, WFlags f = 0 )</li>
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| 43 | <li class=fn><a href="#~QGridView"><b>~QGridView</b></a> ()</li>
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| 44 | <li class=fn>int <a href="#numRows"><b>numRows</b></a> () const</li>
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| 45 | <li class=fn>virtual void <a href="#setNumRows"><b>setNumRows</b></a> ( int )</li>
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| 46 | <li class=fn>int <a href="#numCols"><b>numCols</b></a> () const</li>
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| 47 | <li class=fn>virtual void <a href="#setNumCols"><b>setNumCols</b></a> ( int )</li>
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| 48 | <li class=fn>int <a href="#cellWidth"><b>cellWidth</b></a> () const</li>
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| 49 | <li class=fn>virtual void <a href="#setCellWidth"><b>setCellWidth</b></a> ( int )</li>
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| 50 | <li class=fn>int <a href="#cellHeight"><b>cellHeight</b></a> () const</li>
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| 51 | <li class=fn>virtual void <a href="#setCellHeight"><b>setCellHeight</b></a> ( int )</li>
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| 52 | <li class=fn>QRect <a href="#cellRect"><b>cellRect</b></a> () const</li>
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| 53 | <li class=fn>QRect <a href="#cellGeometry"><b>cellGeometry</b></a> ( int row, int column )</li>
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| 54 | <li class=fn>QSize <a href="#gridSize"><b>gridSize</b></a> () const</li>
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| 55 | <li class=fn>int <a href="#rowAt"><b>rowAt</b></a> ( int y ) const</li>
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| 56 | <li class=fn>int <a href="#columnAt"><b>columnAt</b></a> ( int x ) const</li>
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| 57 | <li class=fn>void <a href="#repaintCell"><b>repaintCell</b></a> ( int row, int column, bool erase = TRUE )</li>
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| 58 | <li class=fn>void <a href="#updateCell"><b>updateCell</b></a> ( int row, int column )</li>
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| 59 | <li class=fn>void <a href="#ensureCellVisible"><b>ensureCellVisible</b></a> ( int row, int column )</li>
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| 60 | </ul>
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| 61 | <h2>Properties</h2>
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| 62 | <ul>
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| 63 | <li class=fn>int <a href="#cellHeight-prop"><b>cellHeight</b></a> - the height of a grid row</li>
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| 64 | <li class=fn>int <a href="#cellWidth-prop"><b>cellWidth</b></a> - the width of a grid column</li>
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| 65 | <li class=fn>int <a href="#numCols-prop"><b>numCols</b></a> - the number of columns in the grid</li>
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| 66 | <li class=fn>int <a href="#numRows-prop"><b>numRows</b></a> - the number of rows in the grid</li>
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| 67 | </ul>
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| 68 | <h2>Protected Members</h2>
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| 69 | <ul>
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| 70 | <li class=fn>virtual void <a href="#paintCell"><b>paintCell</b></a> ( QPainter * p, int row, int col ) = 0</li>
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| 71 | <li class=fn>virtual void <a href="#paintEmptyArea"><b>paintEmptyArea</b></a> ( QPainter * p, int cx, int cy, int cw, int ch )</li>
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| 72 | <li class=fn>virtual void <a href="#dimensionChange"><b>dimensionChange</b></a> ( int oldNumRows, int oldNumCols )</li>
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| 73 | </ul>
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| 74 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 75 |
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| 76 |
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| 77 | The QGridView class provides an abstract base for
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| 78 | fixed-size grids.
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| 79 | <p>
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| 80 | <p> A grid view consists of a number of abstract cells organized in
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| 81 | rows and columns. The cells have a fixed size and are identified
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| 82 | with a row index and a column index. The top-left cell is in row
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| 83 | 0, column 0. The bottom-right cell is in row <a href="#numRows">numRows</a>()-1, column
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| 84 | <a href="#numCols">numCols</a>()-1.
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| 85 | <p> You can define <a href="#numRows-prop">numRows</a>, <a href="#numCols-prop">numCols</a>, <a href="#cellWidth-prop">cellWidth</a> and <a href="#cellHeight-prop">cellHeight</a>. Reimplement the pure virtual function <a href="#paintCell">paintCell</a>() to
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| 86 | draw the contents of a cell.
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| 87 | <p> With <a href="#ensureCellVisible">ensureCellVisible</a>(), you can ensure a certain cell is
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| 88 | visible. With <a href="#rowAt">rowAt</a>() and <a href="#columnAt">columnAt</a>() you can find a cell based on
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| 89 | the given x- and y-coordinates.
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| 90 | <p> If you need to monitor changes to the grid's dimensions (i.e. when
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| 91 | numRows or numCols is changed), reimplement the <a href="#dimensionChange">dimensionChange</a>()
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| 92 | change handler.
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| 93 | <p> Note: the row and column indices are always given in the order,
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| 94 | row (vertical offset) then column (horizontal offset). This order
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| 95 | is the opposite of all pixel operations, which are given in the
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| 96 | order x (horizontal offset), y (vertical offset).
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| 97 | <p> QGridView is a very simple abstract class based on <a href="qscrollview.html">QScrollView</a>. It
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| 98 | is designed to simplify the task of drawing many cells of the same
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| 99 | size in a potentially scrollable canvas. If you need rows and
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| 100 | columns with different sizes, use a <a href="qtable.html">QTable</a> instead. If you need a
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| 101 | simple list of items, use a <a href="qlistbox.html">QListBox</a>. If you need to present
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| 102 | hierachical data use a <a href="qlistview.html">QListView</a>, and if you need random objects
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| 103 | at random positions, consider using either a <a href="qiconview.html">QIconView</a> or a
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| 104 | <a href="qcanvas.html">QCanvas</a>.
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| 105 | <p>See also <a href="abstractwidgets.html">Abstract Widget Classes</a>.
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| 106 |
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| 107 | <hr><h2>Member Function Documentation</h2>
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| 108 | <h3 class=fn><a name="QGridView"></a>QGridView::QGridView ( <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0, WFlags f = 0 )
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| 109 | </h3>
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| 110 | Constructs a grid view.
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| 111 | <p> The <em>parent</em>, <em>name</em> and <a href="qt.html#WidgetFlags">widget flag</a>, <em>f</em>, arguments are passed
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| 112 | to the <a href="qscrollview.html">QScrollView</a> constructor.
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| 113 |
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| 114 | <h3 class=fn><a name="~QGridView"></a>QGridView::~QGridView ()
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| 115 | </h3>
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| 116 | Destroys the grid view.
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| 117 |
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| 118 | <h3 class=fn><a href="qrect.html">QRect</a> <a name="cellGeometry"></a>QGridView::cellGeometry ( int row, int column )
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| 119 | </h3>
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| 120 | Returns the geometry of cell (<em>row</em>, <em>column</em>) in the content
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| 121 | coordinate system.
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| 122 | <p> <p>See also <a href="#cellRect">cellRect</a>().
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| 123 |
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| 124 | <h3 class=fn>int <a name="cellHeight"></a>QGridView::cellHeight () const
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| 125 | </h3><p>Returns the height of a grid row.
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| 126 | See the <a href="qgridview.html#cellHeight-prop">"cellHeight"</a> property for details.
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| 127 | <h3 class=fn><a href="qrect.html">QRect</a> <a name="cellRect"></a>QGridView::cellRect () const
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| 128 | </h3>
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| 129 |
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| 130 | <p> Returns the geometry of a cell in a cell's coordinate system. This
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| 131 | is a convenience function useful in <a href="#paintCell">paintCell</a>(). It is equivalent
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| 132 | to <a href="qrect.html">QRect</a>( 0, 0, <a href="#cellWidth">cellWidth</a>(), <a href="#cellHeight">cellHeight</a>() ).
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| 133 | <p> <p>See also <a href="#cellGeometry">cellGeometry</a>().
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| 134 |
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| 135 | <p>
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| 136 | <h3 class=fn>int <a name="cellWidth"></a>QGridView::cellWidth () const
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| 137 | </h3><p>Returns the width of a grid column.
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| 138 | See the <a href="qgridview.html#cellWidth-prop">"cellWidth"</a> property for details.
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| 139 | <h3 class=fn>int <a name="columnAt"></a>QGridView::columnAt ( int x ) const
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| 140 | </h3>
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| 141 |
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| 142 | <p> Returns the number of the column at position <em>x</em>. <em>x</em> must be
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| 143 | given in content coordinates.
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| 144 | <p> <p>See also <a href="#rowAt">rowAt</a>().
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| 145 |
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| 146 | <h3 class=fn>void <a name="dimensionChange"></a>QGridView::dimensionChange ( int oldNumRows, int oldNumCols )<tt> [virtual protected]</tt>
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| 147 | </h3>
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| 148 |
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| 149 | <p> This change handler is called whenever any of the grid's
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| 150 | dimensions change. <em>oldNumRows</em> and <em>oldNumCols</em> contain the
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| 151 | old dimensions, <a href="#numRows">numRows</a>() and <a href="#numCols">numCols</a>() contain the new
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| 152 | dimensions.
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| 153 |
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| 154 | <h3 class=fn>void <a name="ensureCellVisible"></a>QGridView::ensureCellVisible ( int row, int column )
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| 155 | </h3>
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| 156 | Ensures cell (<em>row</em>, <em>column</em>) is visible, scrolling the grid
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| 157 | view if necessary.
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| 158 |
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| 159 | <h3 class=fn><a href="qsize.html">QSize</a> <a name="gridSize"></a>QGridView::gridSize () const
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| 160 | </h3>
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| 161 |
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| 162 | <p> Returns the size of the grid in pixels.
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| 163 | <p>
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| 164 | <h3 class=fn>int <a name="numCols"></a>QGridView::numCols () const
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| 165 | </h3><p>Returns the number of columns in the grid.
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| 166 | See the <a href="qgridview.html#numCols-prop">"numCols"</a> property for details.
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| 167 | <h3 class=fn>int <a name="numRows"></a>QGridView::numRows () const
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| 168 | </h3><p>Returns the number of rows in the grid.
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| 169 | See the <a href="qgridview.html#numRows-prop">"numRows"</a> property for details.
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| 170 | <h3 class=fn>void <a name="paintCell"></a>QGridView::paintCell ( <a href="qpainter.html">QPainter</a> * p, int row, int col )<tt> [pure virtual protected]</tt>
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| 171 | </h3>
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| 172 |
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| 173 | <p> This pure virtual function is called to paint the single cell at
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| 174 | (<em>row</em>, <em>col</em>) using painter <em>p</em>. The painter must be open when
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| 175 | <a href="#paintCell">paintCell</a>() is called and must remain open.
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| 176 | <p> The coordinate system is <a href="qpainter.html#translate">translated</a> so that the origin is at the top-left corner of the cell
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| 177 | to be painted, i.e. <em>cell</em> coordinates. Do not scale or shear
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| 178 | the coordinate system (or if you do, restore the <a href="qwmatrix.html#TransformationMode">transformation matrix</a> before you return).
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| 179 | <p> The painter is not clipped by default in order to get maximum
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| 180 | efficiency. If you want clipping, use
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| 181 | <p> <pre>
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| 182 | p->setClipRect( <a href="#cellRect">cellRect</a>(), QPainter::CoordPainter );
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| 183 | //... your drawing code
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| 184 | p->setClipping( FALSE );
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| 185 |
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| 186 | </pre>
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| 187 |
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| 188 |
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| 189 | <h3 class=fn>void <a name="paintEmptyArea"></a>QGridView::paintEmptyArea ( <a href="qpainter.html">QPainter</a> * p, int cx, int cy, int cw, int ch )<tt> [virtual protected]</tt>
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| 190 | </h3>
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| 191 | This function fills the <em>cw</em> pixels wide and <em>ch</em> pixels high
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| 192 | rectangle starting at position (<em>cx</em>, <em>cy</em>) with the background
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| 193 | color using the painter <em>p</em>.
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| 194 | <p> <a href="#paintEmptyArea">paintEmptyArea</a>() is invoked by <a href="qscrollview.html#drawContents">drawContents</a>() to erase or fill
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| 195 | unused areas.
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| 196 |
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| 197 | <h3 class=fn>void <a name="repaintCell"></a>QGridView::repaintCell ( int row, int column, bool erase = TRUE )
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| 198 | </h3>
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| 199 | Repaints cell (<em>row</em>, <em>column</em>).
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| 200 | <p> If <em>erase</em> is TRUE, Qt erases the area of the cell before the
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| 201 | <a href="#paintCell">paintCell</a>() call; otherwise no erasing takes place.
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| 202 | <p> <p>See also <a href="qwidget.html#repaint">QWidget::repaint</a>().
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| 203 |
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| 204 | <h3 class=fn>int <a name="rowAt"></a>QGridView::rowAt ( int y ) const
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| 205 | </h3>
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| 206 |
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| 207 | <p> Returns the number of the row at position <em>y</em>. <em>y</em> must be given
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| 208 | in content coordinates.
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| 209 | <p> <p>See also <a href="#columnAt">columnAt</a>().
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| 210 |
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| 211 | <h3 class=fn>void <a name="setCellHeight"></a>QGridView::setCellHeight ( int )<tt> [virtual]</tt>
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| 212 | </h3><p>Sets the height of a grid row.
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| 213 | See the <a href="qgridview.html#cellHeight-prop">"cellHeight"</a> property for details.
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| 214 | <h3 class=fn>void <a name="setCellWidth"></a>QGridView::setCellWidth ( int )<tt> [virtual]</tt>
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| 215 | </h3><p>Sets the width of a grid column.
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| 216 | See the <a href="qgridview.html#cellWidth-prop">"cellWidth"</a> property for details.
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| 217 | <h3 class=fn>void <a name="setNumCols"></a>QGridView::setNumCols ( int )<tt> [virtual]</tt>
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| 218 | </h3><p>Sets the number of columns in the grid.
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| 219 | See the <a href="qgridview.html#numCols-prop">"numCols"</a> property for details.
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| 220 | <h3 class=fn>void <a name="setNumRows"></a>QGridView::setNumRows ( int )<tt> [virtual]</tt>
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| 221 | </h3><p>Sets the number of rows in the grid.
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| 222 | See the <a href="qgridview.html#numRows-prop">"numRows"</a> property for details.
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| 223 | <h3 class=fn>void <a name="updateCell"></a>QGridView::updateCell ( int row, int column )
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| 224 | </h3>
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| 225 | Updates cell (<em>row</em>, <em>column</em>).
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| 226 | <p> <p>See also <a href="qwidget.html#update">QWidget::update</a>().
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| 227 |
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| 228 | <hr><h2>Property Documentation</h2>
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| 229 | <h3 class=fn>int <a name="cellHeight-prop"></a>cellHeight</h3>
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| 230 | <p>This property holds the height of a grid row.
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| 231 | <p>All rows in a grid view have the same height.
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| 232 | <p> <p>See also <a href="#cellWidth-prop">cellWidth</a>.
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| 233 |
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| 234 | <p>Set this property's value with <a href="#setCellHeight">setCellHeight</a>() and get this property's value with <a href="#cellHeight">cellHeight</a>().
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| 235 | <h3 class=fn>int <a name="cellWidth-prop"></a>cellWidth</h3>
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| 236 | <p>This property holds the width of a grid column.
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| 237 | <p>All columns in a grid view have the same width.
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| 238 | <p> <p>See also <a href="#cellHeight-prop">cellHeight</a>.
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| 239 |
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| 240 | <p>Set this property's value with <a href="#setCellWidth">setCellWidth</a>() and get this property's value with <a href="#cellWidth">cellWidth</a>().
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| 241 | <h3 class=fn>int <a name="numCols-prop"></a>numCols</h3>
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| 242 | <p>This property holds the number of columns in the grid.
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| 243 | <p>Set this property's value with <a href="#setNumCols">setNumCols</a>() and get this property's value with <a href="#numCols">numCols</a>().
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| 244 | <p><p>See also <a href="#numRows-prop">numRows</a>.
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| 245 |
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| 246 | <h3 class=fn>int <a name="numRows-prop"></a>numRows</h3>
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| 247 | <p>This property holds the number of rows in the grid.
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| 248 | <p>Set this property's value with <a href="#setNumRows">setNumRows</a>() and get this property's value with <a href="#numRows">numRows</a>().
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| 249 | <p><p>See also <a href="#numCols-prop">numCols</a>.
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| 250 |
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| 251 | <!-- eof -->
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| 252 | <hr><p>
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| 253 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 254 | Copyright © 1995-2007
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| 255 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 256 | <table width=100% cellspacing=0 border=0><tr>
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| 257 | <td>Copyright © 2007
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| 258 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 259 | <td align=right><div align=right>Qt 3.3.8</div>
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| 260 | </table></div></address></body>
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| 261 | </html>
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